N-bromobutanimide → diethyl 5-bromo-2-methyl-6b,9,10,10a-tetrahydro-1H-pyrido[3',4':4,5]pyrrolo[1,2,3-de]quinoxaline-3,8(2H,7H)-dicarboxylate

HRID 1789988Notes

Reaction equation

[CH3:1][CH:2]1[CH2:11][N:10]2[CH:12]3[CH2:17][CH2:16][N:15]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH2:14][CH:13]3[C:8]3[C:9]2=[C:4]([CH:5]=[CH:6][CH:7]=3)[N:3]1[C:23]([O:25][CH2:26][CH3:27])=[O:24].C1C(=O)N([Br:35])C(=O)C1>CN(C=O)C.O>[Br:35][C:6]1[CH:7]=[C:8]2[CH:13]3[CH2:14][N:15]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH2:16][CH2:17][CH:12]3[N:10]3[CH2:11][CH:2]([CH3:1])[N:3]([C:23]([O:25][CH2:26][CH3:27])=[O:24])[C:4]([CH:5]=1)=[C:9]23

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of diethyl 2-methyl-6b,9,10,10a-tetrahydro-1H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxaline-3,8(2H,7H)-dicarboxylate (40 mg, 0.1 mmol) in DMF (10 mL) at 0° C. was added NBS (20 mg, 0.11 mmol) and stirred at 0° C. for 2 hours. The solution was diluted with water (10 mL), and extracted with EtOAc (2×20 mL). The combined extracts were dried over magnesium sulfate, concentrated, and purified by flash chromatography to afford diethyl 5-bromo-2-methyl-6b,9,10,10a-tetrahydro-1H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxaline-3,8(2H,7H)-dicarboxylate (40 mg, 88%) as a clear oil. MS [M+H]+ 454.

Workup

extractionextracted with EtOAc (2×20 mL)
dry with materialThe combined extracts were dried over magnesium sulfate
concentrationconcentrated
custompurified by flash chromatography

Sources & evidence

ORD record: ord-5f7d81cfb0094974a5fcbeb091b6b912
Source dataset: uspto-grants-2006_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07071186B2

Reaction notes

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